Slip



S. F. BASHARA l Oct. 25, 1938.

SLIP Filed Jan. 28,. 1955 F. ASHARA,

INVENOQ BY MWL( ATTORNEYS Patented Oct. 25, 1938 PATENT' oFFICE e ,j SLIP.

4Sanf'niel Ffashara, liouston,rv'1ex. v Y Appiicatin Januayea 1935, serial Na. 3,768

v, j 15 malins.` l(ol. 2li- 263) `The invention. relatesi'tol `an l improvement in v pipe engaging slips of` the typegenerally used in drilling or pumping operations.`

a slip having renewable jaws orliners, each of the jaws having'more than one toothed face so that afresh face may be set to ,engage the pipe by merely adjusting the position of the slip parts.

'a sliphaving` renewable jaws, each of which has a plurality of pipe engaging faces, and which may be turned -to put ans7 ofthe different parts in operative position. l

renewable `slip jaw` having faces thereon adapted to `fit diiferent sizes of pipe. Y

Still another object of the invention isto pro- 'i of the pipe supported, and, in addition, `to Vpro- 25 vide'forresilient means for -holding the jaws p in a substantialh7 aligned position when freefrom load. l

A stillfurthe'r object of the invention is the provision of a renewable backingmember for the.

slip segments, and, when desired, for the provi'- sion of'a resilient cushion betweensaid backing;

member and the segment itself. l z

a backing membersfor a slip segment which may bowls. Y

The` invention contemplates broadly the provision of a `slip in which the pipe jaws day be moved to give fresh pipe engaging areasV without re- 40A placingthe parts, and where the jawsare free to move slightly to align 'themselves with the pipe,

and 'in addition, to adapt the jaws tobe set' to lt is also'` conteme plated that a-"rresiliently mounted backingmernhold various sizes `of pipe.

bermay bev provided on the back. of the segments.

"Figli isatop plan View of aportion of a slip bowl in which are slips constructed in'a'ccord- 55.. ance vwitlri the inventi or1 ,l one .of the segments connection with the handling of pipe in 1 ell v `One of the objects of the invention isto provide Another object of the invention is to provideV Another object of the invention-iste provide E be adapted to fit at least two dilerentsized slip l,

beingY out. away tion. Y

:'Fig,` 2V is asectional View taken along the plane vtoishowthe details of construc- 2`,2 VVofFig; l, andin the direction of the arrows.

Fig; B" is a front View of a removable slip jaw formingcapart of the invention.

Fig. lis a top planview of the jaw.v shown in Fig. 3.

Fig. 5 isa sec'tionalview'of the lower end of the slip segment seen in jFig. 2, showing a slightly different' form of construction.

Fig. 6 isa transverse sectional view takenV along the .planei-' of Fig. 5, and in the direction indicated'by thearrows.

FigJl is a` View similar to Fig. 6 showing the operationof 'onefeature of the invention.

Fig. 8 is `a` broken* front elevation of a slip segment illustrating a somewhat different type of construction, but retaining.. the features of the .-invention.` l'

Fig. 9 isa sectional view taken along the plane 9;910f Fig. `8. l

Fig. 10 is af sectional View taken through the jaw of. Figs. 8 and 9 showing a suggested tooth profile.` t l v Thetype ofpipe engaging slip which I have designed'is adapted tobe seated within the usual downwardlytapered slip bowl l2. Each slip is made upof a plurality of segments Ill adaptedr to be positionedtqlengagethe pipe or, tubing I3. Each segmentislreoessed on its forward face to v Y receive a removable jawfor liner member 25. A further object of theinvention is to.provide Said jaw isl formed .with a pluralityjof pipe engaging faces, each'face of fwhich istoothed to engage the pipefj.: v

4As seen in .'Fig. 3 peach pipe engaging face of th'effjaw f is formed with` flattened .areasv 26 and 27A the areas 26 being :cut more deeply in' the toothed" face ofthe vjaw than are the areas 2l.Y

Referring now to Fig.` 2 the areas 26 and 21 engagethe interior Vwall oftherecess in the segmentllllwhich is shaped toreceivethejaw and, because of their different depths. flattened areas internt` with the face of thesegment leaving a space-23 allowing for relative `longitudinal movementjof the on the segment. This permits a jarring` ationfof thejaw on the segment wlientl'le device` is released .by the upward movemntof the'pi'pelff l p I The upper and lowrends of. each jaw ,arev

recessed atfZSto intert with adowel 2'9f'on the lowerendand na cap screw 3| at"t h'e uppefend thereof.` The doweland screw i-lt loosely in they recess' s o as allow a slight playv of the jaw on its support for more ready adjustment of the jaw to the pipe.

As will be seen in Fig. 1, each jaw has its pipe engaging face recessed on an arc interfltting with the rounded end or face 23 of the segment I4. This allows a rocking of the jaw on the segment to a certain limited extent' which permits adjustment of the jaw to the pipe. There are four similar faces on the jaw shown in Fig. 1 and it will be obvious that where the cap screw 3| is removed the jaw may be partially rotated to present another face to the pipe where wear has taken place on the face originally employed.A I am enabled, therefore, to provide four separate pipe engaging faces to be employed before the jaw has become too dull for further use.

In Fig. 4 I have shown how the jaw'may be varied from that shown in Fig. 1 to provide adjustment for the different sizes of pipe. In this embodiment the jaws are slightly elongated in one direction, the faces, however, being similar in al1 respects to those shown in Fig. l. The pipe engaging faces 34 will be adapted to engage a pipe of smaller diameter than are the two opposed faces 35. The recesses 31 at the upper and lower ends of the jaw are elongated to intert with the cap screw 3l and the dowel 29 when the jaw is mounted on the segment I4.

I have also provided a removable backing strip 39 by means of which the position of the segment I4 may be varied. The said backing strip 39 is preferably rectangular in cross-section and as shown in Figs. 6 and 7 they are fitted-within recesses in the outer side of the segment I4. As the wear strip is wider in one direction than in the other it may be changed as to position within the recess to move the segment at different distances from the bowl in which the slip is seated.

In Fig. 6 the wear strip is placed with its narrow thickness toward the bowl so as to t a bowl of slightly larger diameter. In Fig. 7 the reverse is the case. These wear strips have at their upper end recesses to receive the cap screws 42 fitting within the recesses 4I. I have shown Vthe lower end of each strip inserted within a tapered seat at the lower end of the recess which receives the strip as shown at 40. I may also provide a resilient pad of compressible material such as rubber 43 placed between the wearing strip and the outer side of thev segment I4.

Each segment is provided with one or more laterally extending arms I6 which are adapted to engage with similar arms on adjacent jaws to provide a hinged connection. The ends of these arms are formed with an opening to receive a hinge bolt which allows a pivot connection between adjacent segments. Each arm is formed adjacent its end with lateral shoulders Il which engage to limit the lateral swing of one segment relative to the adjacent segment.

A plurality of jaws thus hinged together may form one complete slip. In Fig. 1 IV have indicated three of such jaws hinged together and provided with a handle I9. Said handle is hinged at its lower end toa pivot pin 2I mounted upon the upper end of a lug 2| on the central segment I4. It is also to be noted that each handle has an inwardly extending arm 22 which is adapted to engage the pipe when the handle I 9 is swung upwardly. With reference particularly to Fig. 2 it will be seen that the upward swinging of the handle I9 will engage the arm 22 with the pipe tending to lmovethe jaw outwardly away from the pipe compressing the pad 43 and allowing the releaseV of the jaws from engagement with the pipe and starting the upward movement of the segment from the slip bowl.

In place of the rubber pad 43 I may place a spring shown at 45 in a recess 46 at the lower end of the segment, the spring being adapted to bear against the wear strip 41. I have also shown the lower end of the wear strip as being provided with a recess 48 to receive a dowel 49 upon which it is loosely mounted. The spring 46 tends to move the lower end of the wear strip against the slip bowl and allow a slight movement thereof which permits release of the jaw from the pipe on the upward movement of the handle I9 as previg ously described.

YWhile the jaws are preferably made in the form shown in Fig. 1 and Fig. 5, I may mount them as shown in Figs. 8 and 9. In this case the segment 5I is shown as rounded on its outer side to engage the slip bowl and the wear strip 39 is omitted. The jaw member 51 has two pipe engaging faces either of which may be presented outwardly to engage the pipe. The forward face of the segment 5I has a dove-tailed recess 52 into which one side of thejaw may be engaged, the form of the jaws presenting a double tenon either face of which may engage in the morticed groove in the face of the segment.

I may also provide resilient strips 6I on the forward face of the segment to allow a certain resiliency in the mounting of the jaw and to provide for adjustment of the jaw around the rounded face 53 of the recess. The lower end of the recess 52 is closed at 56 as will be seen in Fig. 8. The upper end of the mortice is closed by a plate 58 held in position by the screw 59.

The forward face of the jaw which engages the pipe may be toothed in variouszways and in Fig. 10 I have indicated a desirable form of tooth which may be used. This tooth is provided by transverse grooves 63 in the pipe engaging face of the jaw. Between the grooves are areas 62 which may be knurled to frictionally engage the pipe. The grooves 63 have their upper walls inclined downwardly and inwardly, and are thus adapted to resist downward movement of the pipe relative to the jaw.

In the use of these slips it will be apparent that the slips are each made up of a plurality of flexibly connected jaws or segments which have a limited lateral rocking and Vertical adjustment which allows the jaws to adjust themselves to irregularities in the pipe and to irregularities in the slip bowl in which they are seated. In case the slip wedges too tightly between the pipe and thebowl, the upward movement of the pipe will cause the jaw member to be moved upward and jar the segment by the engagement of the shoulders at 23 as previously noted. This will loosen the parts and allow the slip to release. By the use of the wear strips 39 it is possible to adjust the jaws vtoward and away from the pipe to accommodate different sizes of bowls. Further, by the use of jaws, oblong in cross-section as shown in Fig. 4 adjustment of each jaw may be made upon its segment to accommodate the different sizes of pipe. The slip is, therefore, remarkably flexible and is adjustable in various ways, not only to present different sides or engaging faces to the pipe, but to accommodate pipe of varying diameter.

'Ihe device is simple in construction and will have many advantages obvious to those skilled in the art.

What I claim is:

1. A pipe engaging slip comprising a plurality enA . of tapered segments adapted to t within a slip bowl, pipe engaging jaws carried by said segments, each of said jaws havingr a plurality of arcuate pipe engaging faces thereon, and releasable means to secure said jaws to said segments whereby either of the pipe engaging faces of each jaw may be turned to contact the pipe.

2. In a pipe engaging slip,. a plurality of tapered segments adapted to fit withinV a slip bowl, flexible connections between said segments, a removable jaw ,carried by each of. said segments, a plurality of concave pipe engaging surfaces on said jaw, and concave-convex bearing surfaces between said jaw and said segment t0 allow rocking of said jaw on saidsegment.

3. In a pipe engaging slip, a plurality of tapered segments adapted to t within a slip bowl, flexible connections between said segments, a removable jaw carried by each of said segjments, said jaw having four pipe engaging faces extending longitudinally thereof, said jaw being relcasably mounted relative to the adjacent segment so that either of the four faces may be presented for contact with the pipe.

4. A slip adapted to be used with either of two different sizes of pipe including a pluralityY of tapered segments, combination four-faced jaws carried by said segments, said jaws being in opposite pairs, and means releasably securing said jaws to said segments, the opposite faces of. said combination jaws forming one pair being formed to engage the same size pipe, said jaws differing in distance across the respective pairs of jaws to compensate for the difference in diameter of the two sizes of pipeto be engaged. 5. In combination with a slip segment, a renewable backing member interposed between said segment and the slip bowl, and a yieldable support between said slip segment and said backing member adapted to be compressed by the wedging of the segment. Y

6. In combination with a slip segment adapted to fit a slip bowl, a renewable backing member interposed between said segment and the slip bowl, said backing member being substantially rectangular in cross-section and adapted to be turned to vary the thickness of the assembled slip segment so as to fit in slip bowls of different sizes. v i 7. In` combination with a slip segment, a renewable backing member therefor adapted to engage the slip bowl, means to secure said member in position, and a layer of. resilient material between said member and said slip segment.

8. In combination with a slip segment, a renewable backing member interposed between said segment and the slip bowl, resilient elements vtending to separate said member from said segment, and means to limit the movement of said backing member.

9.A In a device forsupporting4 pipe in wells, a downwardly tapered slip segment, a channel along the front vertical face thereof, a pipe engaging jaw insertable into said channel and securable therein, pipe engaging faces on the front and back of said jaw, said jaw being slidably removable and reversible whereby either oi' said faces may be positioned to contact a pipe. d l0. A slip segment, a groove extending vertically therealong, a pipe engaging jaw insertable into said groove, concave pipe engaging areas on the opposite faces of said jaw, and slots in the side of said jaws, the walls of said groove being formed to engage said slots to hold said jaw in place. Y

11. A slip segment, agroove extending vertically therealong, a pipe engaging jaw insertable into said groove, concave pipe engaging areas on the opposite faces of said jaw, slots in the sides of said jaws, the walls of said groove being formed to engage said slots to hold said jaw in place, and a convex bottom in said groove to support said jaw.

l2. In .combination with a slip having a plurality of jaws adapted to engage a pipe, a handle for lifting said slip, a pivoted connection between said handle and said slip whereby said handle normally falls to a lowered position, and means responsive to the raising of said handle to engage the work and thus to force the slip d away from the pipe.

' 13. A slip segment, a longitudinal groove on the forward side thereof, a pipe engaging jaw slidable longitudinally in said groove, concaved pipeengaging areas on the opposite faces of said jaw,

. a resilient cushioning means engaging the inner V it may have a rocking movement on said segment against the pressure of said resilient means.

15. A supporting segment the forward face of which is convex, a pipe engaging jaw having a plurality of concave faces to engage said convex face, means lon said segment to retain said jaw movably in position on said segment, rubber cushions at each side of said face to yieldably engage said jaw, and pipe engaging teeth on the concave faces of said jaw.

SAMUEL F. BASHARA. 

